The Number of Bones in a Newborn Exceeds the Number

The number of bones in a newborn exceeds the number of bones in an adult.Why would the number of bones decrease over time?

A) Some bones are lost due to replacement, like the loss of baby teeth.
B) As some bones grow larger others do not and are no longer needed.
C) The bones of a baby are more fragile than an adult, so more are needed to support the weight of the body.
D) Some of the bones of babies will eventually fuse together to become one larger bone.